Cut-off-valve gear



(No Model.) 2 Sheets-Sheet 1.

H. 1-". GASKILL.

GUT-OFF VALVE GEAR.

No. 391,040. Patented Oct. 16, 1888.

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UNITED STATES PATENT OFFICE.

HARVEY F. GASKILL, OF LOOKPORT, NEW YORK.

CUT-OFF-VALVE GEAR.

.iPBCIPICATION forming part of Letters Patent No. 391,040, dated October16, 1888.

Application filed June 4, 1888.

To all whom, it may concern:

Be it known that l, HARVEY F. GASKILL,Of Lockport, New York, haveinvented certain new and useful Improvements in Out Off- Valve Gears, ofwhich thcfollowingis a specitication.

The object of this invention is to provide a simple and reliableapparatus for actuating the valves of an engine, which willautomatically cut off or close the valve at any desired point of thestroke, and also give a long range of cutoff, varying from nothing tofull-stroke.

To these ends the invention consists in the devices or combinationsrecited in the claims at the end hereof.

The invention is more particularly applicable to engines of the Corlisstype.

In the drawings I have shown the mechanism applied to theadmission-valve of a steamengine and containing my invention in the bestform in which I have as yet embodied it.

In the drawings, Figure l is an end view of a valve-stem and contiguousmechanism. Fig. 2 is a longitudinal section of the parts shown inFig. 1. Fig. 3 is a top view of the devices which regulate the point ofcutoff. Fig. 4 is a section of the same, and Fig. 5 is a detail.

In the several figures, 1 is the valve-stem.

2 is the bearing bolted to the steam-cylinder, which supports thevalve-stem.

3 is an arm, keyed to the end of the valvestem by a key, 4.

5 is a collar mounted loosely on the valvestem between the bearing 2 andthe hub of arm 3.

6 is an arm on collar 5.

7 is a pin on arm 6, and 8 is a link connecting pin 7 with a moving partof the enginesuch as the ordinary wrist-plate of a Corliss engine-sothat the collar 5 is oscillated back and forth thereby.

9 is another arm on collar 5, projecting from it in the generaldirection of arm 3.

10 is a pin on the arm 9. At one limit of the oscillation of arm 9 pin10 engages alatch,

11, which is pivoted at 12 to arm 3. The arm 3 and the valvestem with itis thus oscillated in one direction by arm 9 through a part or the wholeof the stroke of the latter, according to when thelatch is tripped. Thevalveis opened by this motion.

Serial No. 275,911. (No model.)

13 is a spring to press the latch 11 inward.

14 is a link connecting a pin, 15, on arm 3 with the dash-pot.

16 is a pin arranged in a groove or hole in arm 3, with one end againstlatch 11 and the other end against a bent lever, 17, which is pivoted at18 to the arm 3. The bent lever is also connected to a spline, 19, whichis capable of sliding in a groove in the valve stem 1.

20 is a collarloosely fitted on the valve stem 1 and attached to spline19, so that when the collar slides on the valve -stem the spline moveswith it.

21 is a bent lever pivoted at 22, and having one end forked to embracecollar 20, to which it is pivoted, as indicated by the dotted lines inFig. 1. The other end of lever 21 extends into the casing 23 inposit-ion to be operated on by a pin, 24, on a revolving disk, 25. Thisdisk 25 is keyed to the upper end of a shaft, 26, the other end of whichhas keyed to it a pinion, 27, as shown in Fig. 4. In line with shaft 26is another shaft, 28, tothe end of which is keyed a hollow wheel orcasing, 29. This wheel has an interior spoke or web,which carries abearing, 30, in which a pin or arbor, 31, is mounted, so as to turnfreely therein. On one end of the pin 31 isagear, 32,which meshes withpinion 27. On the other end of the pin is a pinion, 33, which mesheswith a gear, 34., placed loosely on shaft 28 within the wheel 29.Connected to the gear 34: is an arm, 35, the end of which is connectedby alink, 36, to the governor.

The operation of this apparatus is as follows: The shaft 28 is revolvedby the engine at the same speed as its main shaft, and of course wheel29 turns with it and carries pin 31 with it. Gear 34 being stationary,pinion 33 is rolled around it, and by means of pin 31 causes gear 32 torevolve. This gives pinion 27 and shaft 26 a revolution in the contrarydirection to that of shaft 28. Shaft 26 by its revolution turns disk 25,which is keyed to it, and brings pin 24 in contact with lever 21 onceduring each revolution, and thereby operates the lever, slides collar 20and spline 19 with it, and thereby, through lever 17, causes pin 16 totrip latch 11 and release arm 3, which immediately closes the valve. Thepoint of the stroke at which this closing of the valve takes place is ofcourse dependent on the time at which pin 24 strikes lever 21, and thisis varied by the governor operating through link 36 and arm 35 to changethe position of gear 34. Shaft 26 should be so geared as to make onerevolution to each revolution of shaft 28. This may of course be done byvarious pro portions of gears. I have found a convenient proportion forthe gears to be, forty teeth on gear 34, thirty teeth on pinion 33,forty-two teeth on gear 32, and twenty-eight teeth on pinion 27. 7 h

I have not thought it necessary to show all of the connections of thismechanism with the engine, as doing so would simply complicate thedrawings and render the specification unnecessarily prolix. The mechanicfamiliar with the ordinary types of Corliss engines and valve-gear willhave no difficulty in applying my mechanism to them, nor in applying itto other engines to which it may be applicable.

What I claim is 1. The sun-andsplanet gears for tripping the latch andreleasing the valve, the stationary gear of which has-its positionchanged by the governor to vary the point at which the latch is tripped,substantially as set forth.

2. The combination, substantially as set forth, of the wheel 29,movingwith the engine, the gears 32 and 33, carried by said wheel, the gear34, acted upon by the governor, and the gear 27, connected with atripping device for tripping a latch and releasing the valve.

3. The combination, substantially as set forth, of the valve-stem,thearm3thereon,connected to the dash-pot and carrying a latch, thecollar 5, oscillated by the engine and engaging said latch to open thevalve, and the sun-and-planet mechanism for tripping the latch andreleasing the valve.

4. The combination, substantially as set forth, of the valve-stem, thearm 3thereon,the latch pivoted to said arm, the spline 19, the bentlever and pin for tripping the latch operated by said spline, andmechanism for moving the spline to trip the latch and release the valveat the desired point of cut-0E.

5. The combination, substantially as set forth, of the sun-and-planetgears, and the cam or pin 24., operated thereby and acting to trip alatch and release the valve at the desired point of cut-off. i

6. The combination, substantially as set forth, of the latch, the pin16, for tripping the latch, the spline 19, the levers connecting thespline with the pin, collar 20, connected to the spline, the cam or pin24, and the lever operated by said pin and acting to move the spline andtrip the latch.

WILLARD T. SEARS, A. L. DAVISON.

